Hello,
i think we have few options here:
1) revert back original tapwrite function that was changed in v. 1.48 and set offset to 2 bytes in top mbuf
2) change current version of tapwrite so it would m_prepend and m_pullup mbuf after m_uiotombuf
3) change m_uiotombuf to accept one more parameter - mbuf offset at which data should be copied. there are not that many users of m_uiotombuf
please find and review the attached patch (untested) that implements option (3) above.
any objections to the attached (revised) patch? can i commit it?
I've tested the code on fbsd-current alpha and it fixes the crash. I was kinda waiting for somebody to test it on sparc, but that's taking a few days longer than expected. I may run a test on one of my own sparcs to verify the results.
That said, the issue seems pretty clear-cut, as is the solution.
I've gotten confirmation that the patch also fixes the crash on RELENG_5/sparc64. Please commit.
thanks. because no one had objections (or rather no one replied :) i went ahead and committed this. so, you all know whom to blame :) as jmg pointed out "align" cannot exceed MHLEN bytes. it it trivial to change should anyone ever require bigger "align".
thanks, max
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